2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparation thereof and the use thereof for the preparation of carotenoids

US5300658A · kind A · utility

Assignee

• BASF SE

Inventors

• Juergen Frank · Ludwigshafen, DE
• Udo Rheude · Otterstadt, DE
• Bernhard Schulz · Schwetzingen, DE
• Joachim Paust · Schifferstadt, DE
• Eckhard Hickmann · Schifferstadt, DE

Key dates

• Filing date: Apr 10, 1992
• Grant date: Apr 5, 1994
• Expiry date: Apr 10, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/28
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans of the formula I ##STR1## where R.sup.1 and R.sup.2 can be identical or different and can be alkyl of 1 to 4 carbons, the preparation thereof by reaction of 2,5-dialkoxy-2,5-dihydrofurans of the formula II ##STR2## In the presence of protic acids or Lewis acids with an alkyl propenyl ether of the formula III ##STR3## and the use thereof for preparing 2,7-dimethyl-2,4,6-octatrienedial and symmetric C.sub.40 -carotenoids such as .beta.-carotene, canthaxanthin and astaxanthin, are described.